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        </div><article class="page single"><h1 class="single-title animated flipInX">Spring缓存管理器多级缓存的实现</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="https://wlizhi.cc" title="Author" target="_blank" rel="noopener noreffer author" class="author"><i class="fas fa-user-circle fa-fw"></i>Wlizhi</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/spring/"><i class="far fa-folder fa-fw"></i>spring</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2020-12-16">2020-12-16</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 3690 字&nbsp;
                <i class="far fa-clock fa-fw"></i>&nbsp;预计阅读 8 分钟&nbsp;<span id="/posts/spring/layering-cache/" class="leancloud_visitors" data-flag-title="Spring缓存管理器多级缓存的实现">
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  <ul>
    <li><a href="#1-缓存核心类-layeringcache">1 缓存核心类 LayeringCache</a></li>
    <li><a href="#2-layingrediscachewriter">2 LayingRedisCacheWriter</a></li>
    <li><a href="#3-信道-处理函数映射-channeltopicenum">3 信道-处理函数映射 ChannelTopicEnum</a></li>
    <li><a href="#4-消息监听-redistopiclistener">4 消息监听 RedisTopicListener</a></li>
    <li><a href="#5-消息封装-topicmsgvo">5 消息封装 TopicMsgVo</a></li>
    <li><a href="#6-缓存管理器-layeringcachemanager">6 缓存管理器 LayeringCacheManager</a></li>
    <li><a href="#7-使用---配置缓存管理器">7 使用 - 配置缓存管理器</a></li>
    <li><a href="#8-使用---案例">8 使用 - 案例</a></li>
  </ul>
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            </div><div class="content" id="content"><p>大概今年9月份，在对接抖音抖店 api 时，写的一个多级缓存的实现，本地缓存基于guava。如果需要使用，直接将这些类copy过去就可以。或者这些类抽取到单独的模块，自定义一个 autoconfigurer、start包，就可以无缝整合到 springboot，导包即可自动配置。</p>
<p>基于 RedisCacheManager、RedisCache 等核心类继承扩展。</p>
<p>如果要做的更完善，也可以将本地缓存的一些配置信息，抽取到配置文件中。</p>
<blockquote>
<p>实现中的核心在 LayeringCache、ChannelTopicEnum、RedisTopicListener 这三个类。</p>
</blockquote>
<h2 id="1-缓存核心类-layeringcache">1 缓存核心类 LayeringCache</h2>
<p>继承 RedisCache，自定义我们的缓存控制。</p>
<p>代码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="nd">@Slf4j</span>
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">LayeringCache</span> <span class="kd">extends</span> <span class="n">RedisCache</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">final</span> <span class="n">Cache</span><span class="o">&lt;</span><span class="n">Object</span><span class="o">,</span> <span class="n">Object</span><span class="o">&gt;</span> <span class="n">localCache</span> <span class="o">=</span> <span class="n">CacheBuilder</span><span class="o">.</span><span class="na">newBuilder</span><span class="o">()</span>
</span></span><span class="line"><span class="cl">			<span class="o">.</span><span class="na">initialCapacity</span><span class="o">(</span><span class="n">1000</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">			<span class="o">.</span><span class="na">maximumSize</span><span class="o">(</span><span class="n">20000</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">			<span class="o">.</span><span class="na">expireAfterWrite</span><span class="o">(</span><span class="n">120</span><span class="o">,</span> <span class="n">TimeUnit</span><span class="o">.</span><span class="na">SECONDS</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">			<span class="o">.</span><span class="na">build</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="nf">LayeringCache</span><span class="o">(</span><span class="n">String</span> <span class="n">name</span><span class="o">,</span> <span class="n">LayingRedisCacheWriter</span> <span class="n">cacheWriter</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span> <span class="n">cacheConfig</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">(</span><span class="n">name</span><span class="o">,</span> <span class="n">cacheWriter</span><span class="o">,</span> <span class="n">cacheConfig</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">LayingRedisCacheWriter</span> <span class="nf">getNativeCache</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="o">(</span><span class="n">LayingRedisCacheWriter</span><span class="o">)</span> <span class="kd">super</span><span class="o">.</span><span class="na">getNativeCache</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="n">Object</span> <span class="nf">lookup</span><span class="o">(</span><span class="n">Object</span> <span class="n">key</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 这里是获取缓存时，优先从本地缓存获取。本地缓存和redis缓存时伪实时同步的。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">String</span> <span class="n">completeKey</span> <span class="o">=</span> <span class="n">createCacheKey</span><span class="o">(</span><span class="n">key</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">Object</span> <span class="n">val</span> <span class="o">=</span> <span class="n">localCache</span><span class="o">.</span><span class="na">getIfPresent</span><span class="o">(</span><span class="n">completeKey</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">val</span> <span class="o">==</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="o">(</span><span class="n">val</span> <span class="o">=</span> <span class="kd">super</span><span class="o">.</span><span class="na">lookup</span><span class="o">(</span><span class="n">key</span><span class="o">))</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 如果本地缓存获取不到，则发布REDIS_CACHE_PUT_TOPIC事件，事件内容是 val，即这个缓存值。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// 在事件处理函数中，会将这个值同步到本地缓存中。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="k">this</span><span class="o">.</span><span class="na">publish</span><span class="o">(</span><span class="n">key</span><span class="o">,</span> <span class="n">val</span><span class="o">,</span> <span class="n">ChannelTopicEnum</span><span class="o">.</span><span class="na">REDIS_CACHE_PUT_TOPIC</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span> <span class="k">else</span> <span class="k">if</span> <span class="o">(</span><span class="n">log</span><span class="o">.</span><span class="na">isDebugEnabled</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">log</span><span class="o">.</span><span class="na">debug</span><span class="o">(</span><span class="s">&#34;从应用内缓存获取数据：name:[{}] key:[{}]&#34;</span><span class="o">,</span> <span class="n">getName</span><span class="o">(),</span> <span class="n">completeKey</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">val</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">put</span><span class="o">(</span><span class="n">Object</span> <span class="n">key</span><span class="o">,</span> <span class="n">Object</span> <span class="n">value</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">key</span><span class="o">,</span> <span class="n">value</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 发布 REDIS_CACHE_PUT_TOPIC 事件，表示新增一个缓存内容。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">this</span><span class="o">.</span><span class="na">publish</span><span class="o">(</span><span class="n">key</span><span class="o">,</span> <span class="n">value</span><span class="o">,</span> <span class="n">ChannelTopicEnum</span><span class="o">.</span><span class="na">REDIS_CACHE_PUT_TOPIC</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">ValueWrapper</span> <span class="nf">putIfAbsent</span><span class="o">(</span><span class="n">Object</span> <span class="n">key</span><span class="o">,</span> <span class="n">Object</span> <span class="n">value</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">ValueWrapper</span> <span class="n">valueWrapper</span> <span class="o">=</span> <span class="kd">super</span><span class="o">.</span><span class="na">putIfAbsent</span><span class="o">(</span><span class="n">key</span><span class="o">,</span> <span class="n">value</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 发布 REDIS_CACHE_PUT_TOPIC 事件，表示新增一个缓存内容。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">this</span><span class="o">.</span><span class="na">publish</span><span class="o">(</span><span class="n">key</span><span class="o">,</span> <span class="n">value</span><span class="o">,</span> <span class="n">ChannelTopicEnum</span><span class="o">.</span><span class="na">REDIS_CACHE_PUT_TOPIC</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">valueWrapper</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">evict</span><span class="o">(</span><span class="n">Object</span> <span class="n">key</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">.</span><span class="na">evict</span><span class="o">(</span><span class="n">key</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 发布 REDIS_CACHE_CLEAR_TOPIC 事件，表示移除了一个缓存内容。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">this</span><span class="o">.</span><span class="na">publish</span><span class="o">(</span><span class="n">key</span><span class="o">,</span> <span class="kc">null</span><span class="o">,</span> <span class="n">ChannelTopicEnum</span><span class="o">.</span><span class="na">REDIS_CACHE_CLEAR_TOPIC</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="kt">void</span> <span class="nf">publish</span><span class="o">(</span><span class="n">Object</span> <span class="n">key</span><span class="o">,</span> <span class="n">Object</span> <span class="n">value</span><span class="o">,</span> <span class="n">ChannelTopicEnum</span> <span class="n">topic</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;</span> <span class="n">msg</span> <span class="o">=</span> <span class="k">new</span> <span class="n">TopicMsgVo</span><span class="o">&lt;&gt;(</span><span class="n">getName</span><span class="o">(),</span> <span class="n">key</span><span class="o">,</span> <span class="n">value</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">getNativeCache</span><span class="o">().</span><span class="na">getConnectionFactory</span><span class="o">().</span><span class="na">getConnection</span><span class="o">().</span><span class="na">publish</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">				<span class="n">topic</span><span class="o">.</span><span class="na">getChannel</span><span class="o">().</span><span class="na">getBytes</span><span class="o">(),</span> <span class="n">TopicMsgVo</span><span class="o">.</span><span class="na">serializeValue</span><span class="o">(</span><span class="n">msg</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 处理新增消息
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @param msg 消息封装
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="kt">void</span> <span class="nf">processPutMsg</span><span class="o">(</span><span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;</span> <span class="n">msg</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">String</span> <span class="n">completeKey</span> <span class="o">=</span> <span class="n">createCacheKey</span><span class="o">(</span><span class="n">msg</span><span class="o">.</span><span class="na">getKey</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">msg</span><span class="o">.</span><span class="na">getValue</span><span class="o">()</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">localCache</span><span class="o">.</span><span class="na">invalidate</span><span class="o">(</span><span class="n">completeKey</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">localCache</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">completeKey</span><span class="o">,</span> <span class="n">msg</span><span class="o">.</span><span class="na">getValue</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 处理清除缓存消息
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @param msg 消息封装
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="kt">void</span> <span class="nf">processClearMsg</span><span class="o">(</span><span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;</span> <span class="n">msg</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">Object</span> <span class="n">key</span> <span class="o">=</span> <span class="n">createCacheKey</span><span class="o">(</span><span class="n">msg</span><span class="o">.</span><span class="na">getKey</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">key</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">localCache</span><span class="o">.</span><span class="na">invalidate</span><span class="o">(</span><span class="n">key</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">localCache</span><span class="o">.</span><span class="na">invalidateAll</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 创建缓存数据的key
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @param key key
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @return 生成的缓存key
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="n">String</span> <span class="nf">createCacheKey</span><span class="o">(</span><span class="n">Object</span> <span class="n">key</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">String</span> <span class="n">cacheKey</span> <span class="o">=</span> <span class="kd">super</span><span class="o">.</span><span class="na">createCacheKey</span><span class="o">(</span><span class="n">key</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(!</span><span class="n">getCacheConfiguration</span><span class="o">().</span><span class="na">usePrefix</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="n">cacheKey</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="n">String</span> <span class="n">name</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">getName</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// spring的cacheKey默认分隔符是 :: ，这里改写成 :，即将两个冒号改成一个冒号分隔。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">cacheKey</span><span class="o">.</span><span class="na">length</span><span class="o">()</span> <span class="o">==</span> <span class="n">name</span><span class="o">.</span><span class="na">length</span><span class="o">()</span> <span class="o">+</span> <span class="n">key</span><span class="o">.</span><span class="na">toString</span><span class="o">().</span><span class="na">length</span><span class="o">()</span> <span class="o">+</span> <span class="n">2</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">cacheKey</span> <span class="o">=</span> <span class="n">cacheKey</span><span class="o">.</span><span class="na">substring</span><span class="o">(</span><span class="n">0</span><span class="o">,</span> <span class="n">name</span><span class="o">.</span><span class="na">length</span><span class="o">())</span> <span class="o">+</span> <span class="n">cacheKey</span><span class="o">.</span><span class="na">substring</span><span class="o">(</span><span class="n">name</span><span class="o">.</span><span class="na">length</span><span class="o">()</span> <span class="o">+</span> <span class="n">1</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">cacheKey</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 处理过期消息
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @param stringTopicMsgVo
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="kt">void</span> <span class="nf">processExpireMsg</span><span class="o">(</span><span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;</span> <span class="n">stringTopicMsgVo</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kt">byte</span><span class="o">[]</span> <span class="n">keyBytes</span> <span class="o">=</span> <span class="o">(</span><span class="kt">byte</span><span class="o">[])</span> <span class="n">stringTopicMsgVo</span><span class="o">.</span><span class="na">getKey</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="n">localCache</span><span class="o">.</span><span class="na">invalidate</span><span class="o">(</span><span class="n">keyBytes</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="2-layingrediscachewriter">2 LayingRedisCacheWriter</h2>
<p>拷贝一个 DefaultRedisCacheWriter 源码，更名为 LayingRedisCacheWriter。</p>
<p>在LayeringCacheManager和 LayeringCache 中需要用到，由于包权限问题，不能直接访问 DefaultRedisCacheWriter，所以需要定义一个。</p>
<h2 id="3-信道-处理函数映射-channeltopicenum">3 信道-处理函数映射 ChannelTopicEnum</h2>
<p>用于存储 LayeringCache 中的一些事件与处理函数的映射关系。比如我们从缓存删除一条数据，那么负载的所有机器都应该将自己的本地缓存的该值移除，以保持数据一致。</p>
<p>代码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm"> * 信道枚举
</span></span></span><span class="line"><span class="cl"><span class="cm"> * 这里定义了redis缓存中不同的操作事件与处理方法的映射关系。
</span></span></span><span class="line"><span class="cl"><span class="cm"> * @author Eddie
</span></span></span><span class="line"><span class="cl"><span class="cm"> */</span>
</span></span><span class="line"><span class="cl"><span class="nd">@Getter</span>
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">enum</span> <span class="n">ChannelTopicEnum</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * redis缓存内容变动通知
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="n">REDIS_CACHE_PUT_TOPIC</span><span class="o">(</span><span class="s">&#34;tiktok:cache:redis:put&#34;</span><span class="o">,</span> <span class="n">LayeringCache</span><span class="o">::</span><span class="n">processPutMsg</span><span class="o">),</span>
</span></span><span class="line"><span class="cl">	<span class="n">REDIS_CACHE_CLEAR_TOPIC</span><span class="o">(</span><span class="s">&#34;tiktok:cache:redis:clear&#34;</span><span class="o">,</span> <span class="n">LayeringCache</span><span class="o">::</span><span class="n">processClearMsg</span><span class="o">),</span>
</span></span><span class="line"><span class="cl">	<span class="n">REDIS_CACHE_CLEAR_EXPIRE</span><span class="o">(</span><span class="s">&#34;tiktok:cache:redis:expire&#34;</span><span class="o">,</span> <span class="n">LayeringCache</span><span class="o">::</span><span class="n">processExpireMsg</span><span class="o">),</span>
</span></span><span class="line"><span class="cl">	<span class="o">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="n">ChannelTopicEnum</span><span class="o">(</span><span class="n">String</span> <span class="n">channel</span><span class="o">,</span> <span class="n">BiConsumer</span><span class="o">&lt;</span><span class="n">LayeringCache</span><span class="o">,</span> <span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;&gt;</span> <span class="n">processNoticeFun</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">channel</span> <span class="o">=</span> <span class="n">channel</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">processNoticeFun</span> <span class="o">=</span> <span class="n">processNoticeFun</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 消息发布信道
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">final</span> <span class="n">String</span> <span class="n">channel</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 缓存数据变动后，本地缓存处理方法
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">final</span> <span class="n">BiConsumer</span><span class="o">&lt;</span><span class="n">LayeringCache</span><span class="o">,</span> <span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;&gt;</span> <span class="n">processNoticeFun</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">static</span> <span class="kd">final</span> <span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">ChannelTopicEnum</span><span class="o">&gt;</span> <span class="n">TOPIC_MAP</span> <span class="o">=</span> <span class="k">new</span> <span class="n">HashMap</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">static</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">ChannelTopicEnum</span> <span class="n">value</span> <span class="o">:</span> <span class="n">ChannelTopicEnum</span><span class="o">.</span><span class="na">values</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">TOPIC_MAP</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">value</span><span class="o">.</span><span class="na">getChannel</span><span class="o">(),</span> <span class="n">value</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kd">static</span> <span class="n">ChannelTopicEnum</span> <span class="nf">getByChannel</span><span class="o">(</span><span class="n">String</span> <span class="n">channel</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">TOPIC_MAP</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="n">channel</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="4-消息监听-redistopiclistener">4 消息监听 RedisTopicListener</h2>
<p>代码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm"> * redis监听器，用来监听自定义的一些channel、包括新增、删除、过期事件。
</span></span></span><span class="line"><span class="cl"><span class="cm"> * @author Eddie
</span></span></span><span class="line"><span class="cl"><span class="cm"> */</span>
</span></span><span class="line"><span class="cl"><span class="nd">@ConditionalOnProperty</span><span class="o">(</span><span class="n">prefix</span> <span class="o">=</span> <span class="s">&#34;tiktok&#34;</span><span class="o">,</span> <span class="n">name</span> <span class="o">=</span> <span class="s">&#34;use-layering&#34;</span><span class="o">,</span> <span class="n">havingValue</span> <span class="o">=</span> <span class="s">&#34;true&#34;</span><span class="o">)</span>
</span></span><span class="line"><span class="cl"><span class="nd">@Slf4j</span>
</span></span><span class="line"><span class="cl"><span class="nd">@Configuration</span>
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">RedisTopicListener</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 消息适配器
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @param cacheManager 缓存管理器
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @return 消息适配器实例
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Bean</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">MessageListenerAdapter</span> <span class="nf">getMessageListenerAdapter</span><span class="o">(</span><span class="n">LayeringCacheManager</span> <span class="n">cacheManager</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="k">new</span> <span class="n">MessageListenerAdapter</span><span class="o">((</span><span class="n">MessageListener</span><span class="o">)</span> <span class="o">(</span><span class="n">message</span><span class="o">,</span> <span class="n">pattern</span><span class="o">)</span> <span class="o">-&gt;</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">try</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 监听的队列信息
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="n">String</span> <span class="n">channel</span> <span class="o">=</span> <span class="k">new</span> <span class="n">String</span><span class="o">(</span><span class="n">message</span><span class="o">.</span><span class="na">getChannel</span><span class="o">(),</span> <span class="n">StandardCharsets</span><span class="o">.</span><span class="na">UTF_8</span><span class="o">.</span><span class="na">name</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 发送的内容信息
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;</span> <span class="n">msgVo</span> <span class="o">=</span> <span class="n">TopicMsgVo</span><span class="o">.</span><span class="na">deserializeValue</span><span class="o">(</span><span class="n">message</span><span class="o">.</span><span class="na">getBody</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 通过channel获取到消息处理方法
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="n">BiConsumer</span><span class="o">&lt;</span><span class="n">LayeringCache</span><span class="o">,</span> <span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;&gt;</span> <span class="n">fun</span> <span class="o">=</span> <span class="n">ChannelTopicEnum</span><span class="o">.</span><span class="na">getByChannel</span><span class="o">(</span><span class="n">channel</span><span class="o">).</span><span class="na">getProcessNoticeFun</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">				<span class="k">if</span> <span class="o">(</span><span class="n">log</span><span class="o">.</span><span class="na">isDebugEnabled</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="n">log</span><span class="o">.</span><span class="na">debug</span><span class="o">(</span><span class="s">&#34;redis消息信道：[{}],消息内容:[{}]&#34;</span><span class="o">,</span> <span class="n">channel</span><span class="o">,</span> <span class="n">msgVo</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 获取多级缓存对象 LayeringCache
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="n">LayeringCache</span> <span class="n">originCache</span> <span class="o">=</span> <span class="n">cacheManager</span><span class="o">.</span><span class="na">getOriginCache</span><span class="o">(</span><span class="n">Objects</span><span class="o">.</span><span class="na">requireNonNull</span><span class="o">(</span><span class="n">msgVo</span><span class="o">).</span><span class="na">getName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">				<span class="k">if</span> <span class="o">(</span><span class="n">originCache</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="c1">// 如果缓存是存在的，则调用回调函数，进行事件的处理。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>					<span class="n">fun</span><span class="o">.</span><span class="na">accept</span><span class="o">(</span><span class="n">originCache</span><span class="o">,</span> <span class="n">msgVo</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="n">UnsupportedEncodingException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">log</span><span class="o">.</span><span class="na">warn</span><span class="o">(</span><span class="n">e</span><span class="o">.</span><span class="na">getMessage</span><span class="o">(),</span> <span class="n">e</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">});</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 消息监听容器
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @param template RedisTemplate
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @param messageListenerAdapter 消息适配器
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @return 消息监听容器
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Bean</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">RedisMessageListenerContainer</span> <span class="nf">getRedisMessageListenerContainer</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">			<span class="n">RedisTemplate</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">Object</span><span class="o">&gt;</span> <span class="n">template</span><span class="o">,</span> <span class="n">MessageListenerAdapter</span> <span class="n">messageListenerAdapter</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">RedisMessageListenerContainer</span> <span class="n">container</span> <span class="o">=</span> <span class="k">new</span> <span class="n">RedisMessageListenerContainer</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="n">container</span><span class="o">.</span><span class="na">setConnectionFactory</span><span class="o">(</span><span class="n">Objects</span><span class="o">.</span><span class="na">requireNonNull</span><span class="o">(</span><span class="n">template</span><span class="o">.</span><span class="na">getConnectionFactory</span><span class="o">()));</span>
</span></span><span class="line"><span class="cl">		<span class="n">ChannelTopicEnum</span><span class="o">[]</span> <span class="n">values</span> <span class="o">=</span> <span class="n">ChannelTopicEnum</span><span class="o">.</span><span class="na">values</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">ChannelTopicEnum</span> <span class="n">value</span> <span class="o">:</span> <span class="n">values</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 将所有定义的channel常量，添加到监听。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">container</span><span class="o">.</span><span class="na">addMessageListener</span><span class="o">(</span><span class="n">messageListenerAdapter</span><span class="o">,</span> <span class="k">new</span> <span class="n">ChannelTopic</span><span class="o">(</span><span class="n">value</span><span class="o">.</span><span class="na">getChannel</span><span class="o">()));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">container</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * key过期监听
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Bean</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">KeyExpirationEventMessageListener</span> <span class="nf">getKeyExpirationEventMessageListener</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">			<span class="n">RedisMessageListenerContainer</span> <span class="n">container</span><span class="o">,</span> <span class="n">LayeringCacheManager</span> <span class="n">cacheManager</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="k">new</span> <span class="n">LayeringKeyExpirationEventMessageListener</span><span class="o">(</span><span class="n">container</span><span class="o">,</span> <span class="n">cacheManager</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">static</span> <span class="kd">class</span> <span class="nc">LayeringKeyExpirationEventMessageListener</span> <span class="kd">extends</span> <span class="n">KeyExpirationEventMessageListener</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">private</span> <span class="n">LayeringCacheManager</span> <span class="n">cacheManager</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="nf">LayeringKeyExpirationEventMessageListener</span><span class="o">(</span><span class="n">RedisMessageListenerContainer</span> <span class="n">listenerContainer</span><span class="o">,</span> <span class="n">LayeringCacheManager</span> <span class="n">cacheManager</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="kd">super</span><span class="o">(</span><span class="n">listenerContainer</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">this</span><span class="o">.</span><span class="na">cacheManager</span> <span class="o">=</span> <span class="n">cacheManager</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">		<span class="kd">protected</span> <span class="kt">void</span> <span class="nf">doHandleMessage</span><span class="o">(</span><span class="n">Message</span> <span class="n">message</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">log</span><span class="o">.</span><span class="na">isDebugEnabled</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">log</span><span class="o">.</span><span class="na">debug</span><span class="o">(</span><span class="s">&#34;redisKey:{}过期，从本地缓存中移除&#34;</span><span class="o">,</span> <span class="k">new</span> <span class="n">String</span><span class="o">(</span><span class="n">message</span><span class="o">.</span><span class="na">getBody</span><span class="o">()));</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 当监听到过期事件后，获取到回调函数，通过回调，移除本地缓存。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">BiConsumer</span><span class="o">&lt;</span><span class="n">LayeringCache</span><span class="o">,</span> <span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;&gt;</span> <span class="n">fun</span> <span class="o">=</span> <span class="n">ChannelTopicEnum</span><span class="o">.</span><span class="na">REDIS_CACHE_CLEAR_EXPIRE</span><span class="o">.</span><span class="na">getProcessNoticeFun</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">			<span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;</span> <span class="n">msgVo</span> <span class="o">=</span> <span class="k">new</span> <span class="n">TopicMsgVo</span><span class="o">&lt;&gt;(</span><span class="kc">null</span><span class="o">,</span> <span class="n">message</span><span class="o">.</span><span class="na">getBody</span><span class="o">(),</span> <span class="kc">null</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">Collection</span><span class="o">&lt;</span><span class="n">LayeringCache</span><span class="o">&gt;</span> <span class="n">caches</span> <span class="o">=</span> <span class="n">cacheManager</span><span class="o">.</span><span class="na">getOriginCaches</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">			<span class="k">for</span> <span class="o">(</span><span class="n">LayeringCache</span> <span class="n">cache</span> <span class="o">:</span> <span class="n">caches</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">fun</span><span class="o">.</span><span class="na">accept</span><span class="o">(</span><span class="n">cache</span><span class="o">,</span> <span class="n">msgVo</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="5-消息封装-topicmsgvo">5 消息封装 TopicMsgVo</h2>
<p>代码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm"> * 消息封装及消息的序列化
</span></span></span><span class="line"><span class="cl"><span class="cm"> * @author Eddie
</span></span></span><span class="line"><span class="cl"><span class="cm"> */</span>
</span></span><span class="line"><span class="cl"><span class="nd">@Slf4j</span>
</span></span><span class="line"><span class="cl"><span class="nd">@Data</span>
</span></span><span class="line"><span class="cl"><span class="nd">@NoArgsConstructor</span>
</span></span><span class="line"><span class="cl"><span class="nd">@AllArgsConstructor</span>
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">TopicMsgVo</span><span class="o">&lt;</span><span class="n">N</span><span class="o">,</span> <span class="n">K</span><span class="o">,</span> <span class="n">V</span><span class="o">&gt;</span> <span class="kd">implements</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="cm">/** 名称 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="n">N</span> <span class="n">name</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="cm">/** 缓存key */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="n">K</span> <span class="n">key</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="cm">/** 值 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="n">V</span> <span class="n">value</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 序列化
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @param msg 消息封装
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @return 转换成字节数组
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kd">static</span> <span class="kt">byte</span><span class="o">[]</span> <span class="nf">serializeValue</span><span class="o">(</span><span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;</span> <span class="n">msg</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">ByteArrayOutputStream</span> <span class="n">bos</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ByteArrayOutputStream</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="k">try</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">ObjectOutputStream</span> <span class="n">oos</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ObjectOutputStream</span><span class="o">(</span><span class="n">bos</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">oos</span><span class="o">.</span><span class="na">writeObject</span><span class="o">(</span><span class="n">msg</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="n">Exception</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">log</span><span class="o">.</span><span class="na">warn</span><span class="o">(</span><span class="n">e</span><span class="o">.</span><span class="na">getMessage</span><span class="o">(),</span> <span class="n">e</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">bos</span><span class="o">.</span><span class="na">toByteArray</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 反序列化
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @param bytes 字节数组
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * @return 转换成消息封装对象
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@SuppressWarnings</span><span class="o">(</span><span class="s">&#34;unchecked&#34;</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kd">static</span> <span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;</span> <span class="n">deserializeValue</span><span class="o">(</span><span class="kt">byte</span><span class="o">[]</span> <span class="n">bytes</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">ByteArrayInputStream</span> <span class="n">bis</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ByteArrayInputStream</span><span class="o">(</span><span class="n">bytes</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">try</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="o">(</span><span class="n">TopicMsgVo</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="o">?,</span> <span class="o">?&gt;)</span> <span class="k">new</span> <span class="n">ObjectInputStream</span><span class="o">(</span><span class="n">bis</span><span class="o">).</span><span class="na">readObject</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="n">Exception</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">log</span><span class="o">.</span><span class="na">warn</span><span class="o">(</span><span class="n">e</span><span class="o">.</span><span class="na">getMessage</span><span class="o">(),</span> <span class="n">e</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="6-缓存管理器-layeringcachemanager">6 缓存管理器 LayeringCacheManager</h2>
<p>继承 RedisCacheManager，重写 createRedisCache()。</p>
<p>定义 LayeringCacheManagerBuilder，从 RedisCacheManager 建造类中拷贝，将里面构建的 RedisCache，替换为 LayeringCache。</p>
<p>代码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">LayeringCacheManager</span> <span class="kd">extends</span> <span class="n">RedisCacheManager</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="cm">/** 用来存储 cacheName - LayeringCache映射关系 */</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kd">final</span> <span class="n">ConcurrentHashMap</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">LayeringCache</span><span class="o">&gt;</span> <span class="n">originLayeringCacheMap</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ConcurrentHashMap</span><span class="o">&lt;&gt;(</span><span class="n">16</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="nf">LayeringCacheManager</span><span class="o">(</span><span class="n">RedisCacheWriter</span> <span class="n">cacheWriter</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span> <span class="n">defaultCacheConfiguration</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">(</span><span class="n">cacheWriter</span><span class="o">,</span> <span class="n">defaultCacheConfiguration</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="nf">LayeringCacheManager</span><span class="o">(</span><span class="n">RedisCacheWriter</span> <span class="n">cacheWriter</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span> <span class="n">defaultCacheConfiguration</span><span class="o">,</span> <span class="n">String</span><span class="o">...</span> <span class="n">initialCacheNames</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">(</span><span class="n">cacheWriter</span><span class="o">,</span> <span class="n">defaultCacheConfiguration</span><span class="o">,</span> <span class="n">initialCacheNames</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="nf">LayeringCacheManager</span><span class="o">(</span><span class="n">RedisCacheWriter</span> <span class="n">cacheWriter</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span> <span class="n">defaultCacheConfiguration</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">allowInFlightCacheCreation</span><span class="o">,</span> <span class="n">String</span><span class="o">...</span> <span class="n">initialCacheNames</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">(</span><span class="n">cacheWriter</span><span class="o">,</span> <span class="n">defaultCacheConfiguration</span><span class="o">,</span> <span class="n">allowInFlightCacheCreation</span><span class="o">,</span> <span class="n">initialCacheNames</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="nf">LayeringCacheManager</span><span class="o">(</span><span class="n">RedisCacheWriter</span> <span class="n">cacheWriter</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span> <span class="n">defaultCacheConfiguration</span><span class="o">,</span> <span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span><span class="o">&gt;</span> <span class="n">initialCacheConfigurations</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">(</span><span class="n">cacheWriter</span><span class="o">,</span> <span class="n">defaultCacheConfiguration</span><span class="o">,</span> <span class="n">initialCacheConfigurations</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="nf">LayeringCacheManager</span><span class="o">(</span><span class="n">RedisCacheWriter</span> <span class="n">cacheWriter</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span> <span class="n">defaultCacheConfiguration</span><span class="o">,</span> <span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span><span class="o">&gt;</span> <span class="n">initialCacheConfigurations</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">allowInFlightCacheCreation</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kd">super</span><span class="o">(</span><span class="n">cacheWriter</span><span class="o">,</span> <span class="n">defaultCacheConfiguration</span><span class="o">,</span> <span class="n">initialCacheConfigurations</span><span class="o">,</span> <span class="n">allowInFlightCacheCreation</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">	 * 创建 RedisCache，重写方法的关键在这
</span></span></span><span class="line"><span class="cl"><span class="cm">	 */</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@SneakyThrows</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="n">RedisCache</span> <span class="nf">createRedisCache</span><span class="o">(</span><span class="n">String</span> <span class="n">name</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span> <span class="n">cacheConfig</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">Class</span><span class="o">&lt;?</span> <span class="kd">extends</span> <span class="n">LayeringCacheManager</span><span class="o">&gt;</span> <span class="n">clazz</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">getClass</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="n">Field</span> <span class="n">cacheWriter</span> <span class="o">=</span> <span class="n">ReflectionUtils</span><span class="o">.</span><span class="na">findField</span><span class="o">(</span><span class="n">clazz</span><span class="o">,</span> <span class="s">&#34;cacheWriter&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">cacheWriter</span><span class="o">.</span><span class="na">setAccessible</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">LayingRedisCacheWriter</span> <span class="n">cacheWriterVal</span> <span class="o">=</span> <span class="o">(</span><span class="n">LayingRedisCacheWriter</span><span class="o">)</span> <span class="n">cacheWriter</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="k">this</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">Field</span> <span class="n">defaultCacheConfig</span> <span class="o">=</span> <span class="n">ReflectionUtils</span><span class="o">.</span><span class="na">findField</span><span class="o">(</span><span class="n">clazz</span><span class="o">,</span> <span class="s">&#34;defaultCacheConfig&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">defaultCacheConfig</span><span class="o">.</span><span class="na">setAccessible</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">RedisCacheConfiguration</span> <span class="n">defaultCacheConfigVal</span> <span class="o">=</span> <span class="o">(</span><span class="n">RedisCacheConfiguration</span><span class="o">)</span> <span class="n">defaultCacheConfig</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="k">this</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 使用自定义的 LayeringCache 替换掉原有的 RedisCache
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">LayeringCache</span> <span class="n">cache</span> <span class="o">=</span> <span class="k">new</span> <span class="n">LayeringCache</span><span class="o">(</span><span class="n">name</span><span class="o">,</span> <span class="n">cacheWriterVal</span><span class="o">,</span> <span class="n">cacheConfig</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">?</span> <span class="n">cacheConfig</span> <span class="o">:</span> <span class="n">defaultCacheConfigVal</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">originLayeringCacheMap</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">name</span><span class="o">,</span> <span class="n">cache</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">cache</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="n">RedisCache</span> <span class="nf">getMissingCache</span><span class="o">(</span><span class="n">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="kd">super</span><span class="o">.</span><span class="na">getMissingCache</span><span class="o">(</span><span class="n">name</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">Cache</span> <span class="nf">getCache</span><span class="o">(</span><span class="n">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="kd">super</span><span class="o">.</span><span class="na">getCache</span><span class="o">(</span><span class="n">name</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">LayeringCache</span> <span class="nf">getOriginCache</span><span class="o">(</span><span class="n">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">originLayeringCacheMap</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="n">name</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">Collection</span><span class="o">&lt;</span><span class="n">LayeringCache</span><span class="o">&gt;</span> <span class="nf">getOriginCaches</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">originLayeringCacheMap</span><span class="o">.</span><span class="na">values</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kd">static</span> <span class="kd">class</span> <span class="nc">LayeringCacheManagerBuilder</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kd">private</span> <span class="nd">@Nullable</span>
</span></span><span class="line"><span class="cl">		<span class="n">RedisCacheWriter</span> <span class="n">cacheWriter</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="kd">private</span> <span class="n">RedisCacheConfiguration</span> <span class="n">defaultCacheConfiguration</span> <span class="o">=</span> <span class="n">RedisCacheConfiguration</span><span class="o">.</span><span class="na">defaultCacheConfig</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="kd">private</span> <span class="kd">final</span> <span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span><span class="o">&gt;</span> <span class="n">initialCaches</span> <span class="o">=</span> <span class="k">new</span> <span class="n">LinkedHashMap</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="kd">private</span> <span class="kt">boolean</span> <span class="n">enableTransactions</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="kt">boolean</span> <span class="n">allowInFlightCacheCreation</span> <span class="o">=</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kd">private</span> <span class="nf">LayeringCacheManagerBuilder</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kd">private</span> <span class="nf">LayeringCacheManagerBuilder</span><span class="o">(</span><span class="n">RedisCacheWriter</span> <span class="n">cacheWriter</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">this</span><span class="o">.</span><span class="na">cacheWriter</span> <span class="o">=</span> <span class="n">cacheWriter</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="kd">static</span> <span class="n">LayeringCacheManagerBuilder</span> <span class="nf">fromConnectionFactory</span><span class="o">(</span><span class="n">RedisConnectionFactory</span> <span class="n">connectionFactory</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">connectionFactory</span><span class="o">,</span> <span class="s">&#34;ConnectionFactory must not be null!&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 这里是个关键点，将RedisCache对象替换为自定义的 LayingRedisCacheWriter
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="k">return</span> <span class="k">new</span> <span class="n">LayeringCacheManagerBuilder</span><span class="o">(</span><span class="k">new</span> <span class="n">LayingRedisCacheWriter</span><span class="o">(</span><span class="n">connectionFactory</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="kd">static</span> <span class="n">LayeringCacheManagerBuilder</span> <span class="nf">fromCacheWriter</span><span class="o">(</span><span class="n">LayingRedisCacheWriter</span> <span class="n">cacheWriter</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">cacheWriter</span><span class="o">,</span> <span class="s">&#34;CacheWriter must not be null!&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="k">new</span> <span class="n">LayeringCacheManagerBuilder</span><span class="o">(</span><span class="n">cacheWriter</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="n">LayeringCacheManagerBuilder</span> <span class="nf">cacheDefaults</span><span class="o">(</span><span class="n">RedisCacheConfiguration</span> <span class="n">defaultCacheConfiguration</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">defaultCacheConfiguration</span><span class="o">,</span> <span class="s">&#34;DefaultCacheConfiguration must not be null!&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">this</span><span class="o">.</span><span class="na">defaultCacheConfiguration</span> <span class="o">=</span> <span class="n">defaultCacheConfiguration</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="k">this</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="n">LayeringCacheManagerBuilder</span> <span class="nf">cacheWriter</span><span class="o">(</span><span class="n">RedisCacheWriter</span> <span class="n">cacheWriter</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">cacheWriter</span><span class="o">,</span> <span class="s">&#34;CacheWriter must not be null!&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">this</span><span class="o">.</span><span class="na">cacheWriter</span> <span class="o">=</span> <span class="n">cacheWriter</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="k">this</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="n">LayeringCacheManagerBuilder</span> <span class="nf">transactionAware</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">this</span><span class="o">.</span><span class="na">enableTransactions</span> <span class="o">=</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="k">this</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="n">LayeringCacheManagerBuilder</span> <span class="nf">initialCacheNames</span><span class="o">(</span><span class="n">Set</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span> <span class="n">cacheNames</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">cacheNames</span><span class="o">,</span> <span class="s">&#34;CacheNames must not be null!&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">cacheNames</span><span class="o">.</span><span class="na">forEach</span><span class="o">(</span><span class="n">it</span> <span class="o">-&gt;</span> <span class="n">withCacheConfiguration</span><span class="o">(</span><span class="n">it</span><span class="o">,</span> <span class="n">defaultCacheConfiguration</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="k">this</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="n">LayeringCacheManagerBuilder</span> <span class="nf">withInitialCacheConfigurations</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">				<span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">RedisCacheConfiguration</span><span class="o">&gt;</span> <span class="n">cacheConfigurations</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">			<span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">cacheConfigurations</span><span class="o">,</span> <span class="s">&#34;CacheConfigurations must not be null!&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">cacheConfigurations</span><span class="o">.</span><span class="na">forEach</span><span class="o">((</span><span class="n">cacheName</span><span class="o">,</span> <span class="n">configuration</span><span class="o">)</span> <span class="o">-&gt;</span> <span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">configuration</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">					<span class="n">String</span><span class="o">.</span><span class="na">format</span><span class="o">(</span><span class="s">&#34;RedisCacheConfiguration for cache %s must not be null!&#34;</span><span class="o">,</span> <span class="n">cacheName</span><span class="o">)));</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">			<span class="k">this</span><span class="o">.</span><span class="na">initialCaches</span><span class="o">.</span><span class="na">putAll</span><span class="o">(</span><span class="n">cacheConfigurations</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="k">this</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="n">LayeringCacheManagerBuilder</span> <span class="nf">withCacheConfiguration</span><span class="o">(</span><span class="n">String</span> <span class="n">cacheName</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">		                                                          <span class="n">RedisCacheConfiguration</span> <span class="n">cacheConfiguration</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">cacheName</span><span class="o">,</span> <span class="s">&#34;CacheName must not be null!&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">Assert</span><span class="o">.</span><span class="na">notNull</span><span class="o">(</span><span class="n">cacheConfiguration</span><span class="o">,</span> <span class="s">&#34;CacheConfiguration must not be null!&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">this</span><span class="o">.</span><span class="na">initialCaches</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">cacheName</span><span class="o">,</span> <span class="n">cacheConfiguration</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="k">this</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="n">LayeringCacheManagerBuilder</span> <span class="nf">disableCreateOnMissingCache</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">this</span><span class="o">.</span><span class="na">allowInFlightCacheCreation</span> <span class="o">=</span> <span class="kc">false</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="k">this</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="n">Set</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span> <span class="nf">getConfiguredCaches</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="n">Collections</span><span class="o">.</span><span class="na">unmodifiableSet</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">initialCaches</span><span class="o">.</span><span class="na">keySet</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="n">Optional</span><span class="o">&lt;</span><span class="n">RedisCacheConfiguration</span><span class="o">&gt;</span> <span class="nf">getCacheConfigurationFor</span><span class="o">(</span><span class="n">String</span> <span class="n">cacheName</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="n">Optional</span><span class="o">.</span><span class="na">ofNullable</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">initialCaches</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="n">cacheName</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		
</span></span><span class="line"><span class="cl">		<span class="kd">public</span> <span class="n">LayeringCacheManager</span> <span class="nf">build</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">Assert</span><span class="o">.</span><span class="na">state</span><span class="o">(</span><span class="n">cacheWriter</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">,</span> <span class="s">&#34;CacheWriter must not be null! You can provide one via &#39;RedisCacheManagerBuilder#cacheWriter(RedisCacheWriter)&#39;.&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">LayeringCacheManager</span> <span class="n">cm</span> <span class="o">=</span> <span class="k">new</span> <span class="n">LayeringCacheManager</span><span class="o">(</span><span class="n">cacheWriter</span><span class="o">,</span> <span class="n">defaultCacheConfiguration</span><span class="o">,</span> <span class="n">initialCaches</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">					<span class="n">allowInFlightCacheCreation</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">cm</span><span class="o">.</span><span class="na">setTransactionAware</span><span class="o">(</span><span class="n">enableTransactions</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="n">cm</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="7-使用---配置缓存管理器">7 使用 - 配置缓存管理器</h2>
<p>代码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="nd">@Configuration</span>
</span></span><span class="line"><span class="cl"><span class="nd">@EnableCaching</span>
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">TiktokRedisConfig</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Bean</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">&#34;redisTemplate&#34;</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">RedisTemplate</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">Object</span><span class="o">&gt;</span> <span class="nf">redisTemplate</span><span class="o">(</span><span class="n">RedisConnectionFactory</span> <span class="n">factory</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 创建RedisTemplate&lt;String, Object&gt;对象
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">RedisTemplate</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">Object</span><span class="o">&gt;</span> <span class="n">template</span> <span class="o">=</span> <span class="k">new</span> <span class="n">RedisTemplate</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 配置连接工厂
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">template</span><span class="o">.</span><span class="na">setConnectionFactory</span><span class="o">(</span><span class="n">factory</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 定义Jackson2JsonRedisSerializer序列化对象
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">Jackson2JsonRedisSerializer</span><span class="o">&lt;</span><span class="n">Object</span><span class="o">&gt;</span> <span class="n">jacksonSeial</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Jackson2JsonRedisSerializer</span><span class="o">&lt;&gt;(</span><span class="n">Object</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">ObjectMapper</span> <span class="n">om</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ObjectMapper</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 指定要序列化的域，field,get和set,以及修饰符范围，ANY是都有包括private和public
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">om</span><span class="o">.</span><span class="na">setVisibility</span><span class="o">(</span><span class="n">PropertyAccessor</span><span class="o">.</span><span class="na">ALL</span><span class="o">,</span> <span class="n">JsonAutoDetect</span><span class="o">.</span><span class="na">Visibility</span><span class="o">.</span><span class="na">ANY</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 指定序列化输入的类型，类必须是非final修饰的，final修饰的类，比如String,Integer等会报异常
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">om</span><span class="o">.</span><span class="na">enableDefaultTyping</span><span class="o">(</span><span class="n">ObjectMapper</span><span class="o">.</span><span class="na">DefaultTyping</span><span class="o">.</span><span class="na">NON_FINAL</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">jacksonSeial</span><span class="o">.</span><span class="na">setObjectMapper</span><span class="o">(</span><span class="n">om</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">StringRedisSerializer</span> <span class="n">stringSerial</span> <span class="o">=</span> <span class="k">new</span> <span class="n">StringRedisSerializer</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// redis key 序列化方式使用stringSerial
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">template</span><span class="o">.</span><span class="na">setKeySerializer</span><span class="o">(</span><span class="n">stringSerial</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// redis value 序列化方式使用jackson
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">template</span><span class="o">.</span><span class="na">setValueSerializer</span><span class="o">(</span><span class="n">jacksonSeial</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// redis hash key 序列化方式使用stringSerial
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">template</span><span class="o">.</span><span class="na">setHashKeySerializer</span><span class="o">(</span><span class="n">stringSerial</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// redis hash value 序列化方式使用jackson
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">template</span><span class="o">.</span><span class="na">setHashValueSerializer</span><span class="o">(</span><span class="n">jacksonSeial</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">template</span><span class="o">.</span><span class="na">afterPropertiesSet</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">template</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@ConditionalOnProperty</span><span class="o">(</span><span class="n">prefix</span> <span class="o">=</span> <span class="s">&#34;tiktok&#34;</span><span class="o">,</span> <span class="n">name</span> <span class="o">=</span> <span class="s">&#34;use-layering&#34;</span><span class="o">,</span> <span class="n">havingValue</span> <span class="o">=</span> <span class="s">&#34;false&#34;</span><span class="o">,</span> <span class="n">matchIfMissing</span> <span class="o">=</span> <span class="kc">true</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Bean</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">&#34;cacheManager&#34;</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">CacheManager</span> <span class="nf">cacheManager</span><span class="o">(</span><span class="n">RedisTemplate</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">Object</span><span class="o">&gt;</span> <span class="n">template</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">RedisCacheConfiguration</span> <span class="n">defaultCacheConfiguration</span> <span class="o">=</span> <span class="n">getRedisCacheConfiguration</span><span class="o">(</span><span class="n">template</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">RedisCacheManagerBuilder</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// Redis 连接工厂
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="o">.</span><span class="na">fromConnectionFactory</span><span class="o">(</span><span class="n">Objects</span><span class="o">.</span><span class="na">requireNonNull</span><span class="o">(</span><span class="n">template</span><span class="o">.</span><span class="na">getConnectionFactory</span><span class="o">()))</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 缓存配置
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="o">.</span><span class="na">cacheDefaults</span><span class="o">(</span><span class="n">defaultCacheConfiguration</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 配置同步修改或删除 put/evict
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="o">.</span><span class="na">transactionAware</span><span class="o">()</span>
</span></span><span class="line"><span class="cl">				<span class="o">.</span><span class="na">build</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@ConditionalOnProperty</span><span class="o">(</span><span class="n">prefix</span> <span class="o">=</span> <span class="s">&#34;tiktok&#34;</span><span class="o">,</span> <span class="n">name</span> <span class="o">=</span> <span class="s">&#34;use-layering&#34;</span><span class="o">,</span> <span class="n">havingValue</span> <span class="o">=</span> <span class="s">&#34;true&#34;</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Bean</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">&#34;layeringCacheManager&#34;</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">LayeringCacheManager</span> <span class="nf">layeringCacheManager</span><span class="o">(</span><span class="n">RedisTemplate</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">Object</span><span class="o">&gt;</span> <span class="n">template</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">RedisCacheConfiguration</span> <span class="n">defaultCacheConfiguration</span> <span class="o">=</span> <span class="n">getRedisCacheConfiguration</span><span class="o">(</span><span class="n">template</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">LayeringCacheManager</span><span class="o">.</span><span class="na">LayeringCacheManagerBuilder</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// Redis 连接工厂
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="o">.</span><span class="na">fromConnectionFactory</span><span class="o">(</span><span class="n">Objects</span><span class="o">.</span><span class="na">requireNonNull</span><span class="o">(</span><span class="n">template</span><span class="o">.</span><span class="na">getConnectionFactory</span><span class="o">()))</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 缓存配置
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="o">.</span><span class="na">cacheDefaults</span><span class="o">(</span><span class="n">defaultCacheConfiguration</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 配置同步修改或删除 put/evict
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="o">.</span><span class="na">transactionAware</span><span class="o">()</span>
</span></span><span class="line"><span class="cl">				<span class="o">.</span><span class="na">build</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="n">RedisCacheConfiguration</span> <span class="nf">getRedisCacheConfiguration</span><span class="o">(</span><span class="n">RedisTemplate</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">Object</span><span class="o">&gt;</span> <span class="n">template</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">RedisCacheConfiguration</span>
</span></span><span class="line"><span class="cl">				<span class="o">.</span><span class="na">defaultCacheConfig</span><span class="o">()</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 设置key为String
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="o">.</span><span class="na">serializeKeysWith</span><span class="o">(</span><span class="n">RedisSerializationContext</span><span class="o">.</span><span class="na">SerializationPair</span><span class="o">.</span><span class="na">fromSerializer</span><span class="o">(</span><span class="n">template</span><span class="o">.</span><span class="na">getStringSerializer</span><span class="o">()))</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 设置value 为自动转Json的Object
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="o">.</span><span class="na">serializeValuesWith</span><span class="o">(</span><span class="n">RedisSerializationContext</span><span class="o">.</span><span class="na">SerializationPair</span><span class="o">.</span><span class="na">fromSerializer</span><span class="o">(</span><span class="n">template</span><span class="o">.</span><span class="na">getValueSerializer</span><span class="o">()))</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 不缓存null
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="o">.</span><span class="na">disableCachingNullValues</span><span class="o">()</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 缓存数据保存1小时
</span></span></span><span class="line"><span class="cl"><span class="c1">//						.entryTtl(Duration.ofHours(1));
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="o">.</span><span class="na">entryTtl</span><span class="o">(</span><span class="n">Duration</span><span class="o">.</span><span class="na">ofSeconds</span><span class="o">(</span><span class="n">GlobalConstants</span><span class="o">.</span><span class="na">REDIS_DEFAULT_EXPIRE_SECOND</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="8-使用---案例">8 使用 - 案例</h2>
<p>使用上与spring缓存管理器无任何差别，使用 @Cacheable 等注解即可使缓存生效。</p>
<p>代码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="nd">@Slf4j</span>
</span></span><span class="line"><span class="cl"><span class="nd">@Service</span>
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">UserServiceImpl</span> <span class="kd">implements</span> <span class="n">UserService</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Cacheable</span><span class="o">(</span><span class="n">cacheNames</span> <span class="o">=</span> <span class="s">&#34;tiktok:log:operation-log&#34;</span><span class="o">,</span> <span class="n">key</span> <span class="o">=</span> <span class="s">&#34;#xxx.field1+&#39;-&#39;+#xxx.field2&#34;</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">XXX</span> <span class="nf">getXXX</span><span class="o">(</span><span class="n">XXX</span> <span class="n">xxx</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 业务代码省略...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">return</span> <span class="n">XXX</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
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